Magnetic toner

a toner and magnetic technology, applied in the field of electromagnetic toners, can solve the problems of high charge amount, prone to leakage of charge, and high charge amount, and achieve the effect of suppressing the occurrence of flaws or filming on the photosensitive member, excellent durability and developability, and high degree of blackness
US7368211B2Inactive Publication Date: 2008-05-06CANON KK
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
CANON KK
Publication Date
2008-05-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

To provide a magnetic toner which is excellent in durability and developability even in the case of being applied to high-speed developing process or being used in a large-capacity process cartridge amount of toner in which is increased, and which has high degree of blackness. Provided is a magnetic toner having magnetic toner particles containing at least a binder resin and magnetic material particles each comprising a predetermined amount of a titanium compound, characterized in that:1) the magnetic material particles have a predetermined amount of adsorbed moisture at a relative vapor pressure of 50%; and2) a difference between the amount of moisture adsorbed to the magnetic material particles in an adsorbing process for increasing a relative vapor pressure and the amount of moisture adsorbed to the magnetic material particles in a desorbing process for reducing a relative vapor pressure is reduced.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to: an electrophotograph; an image forming method for visualizing an electrostatic image; and a magnetic toner for toner jetting.

[0003] 2. Description of the Related Art

[0004] In recent years, an image forming apparatus has been further requested to have a high-speed process and long-term high reliability in addition to high definition, high appearance quality, and high image quality. A reduction of toner particle size and a sharpening of a toner particle size distribution have been attempted to achieve a high-resolution and high-definition development method. However, when the particle size of toner is merely reduced, dispersibility of a internal additive into a binder resin is apt to affect toner performance.

[0005] In particular, in the case of magnetic toner having magnetic toner particles used for a one-component development method in which a reduction in size of an image forming apparatus...

Claims

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